Square Root of 40 Simplified

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What is the square root of 40 simplified?

Answer

√40 = 2√10

40 = 4 × 10, and 4 = 2² is the largest perfect square that divides 40, so √40 = √4 × √10 = 2√10. Check: 2√10 ≈ 6.325, the same as √40 ≈ 6.325.

Simplifying √40 Step by Step

1. Prime factorization. — All Prime Factors of 40:

40 = 2 × 2 × 2 × 5 = 23 × 5

2. Pair up equal primes. Each pair is a perfect square and comes out of the root as one factor; a prime without a partner stays under the radical.

Prime factorTimes in 40Comes out of the rootStays under the root
2322
51—5

3. Take the pairs out of the root.

√40 = √((2 × 2) × 2 × 5)

= 2 × √(2 × 5)

= 2√10

4. Check by squaring back.

2² × 10 = 4 × 10 = 40

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This calculator writes a square root in simplest radical form: it finds the largest perfect square that divides the number, takes its root out of the radical and leaves the rest under it. For example, it can help you find out what is the square root of 40 simplified? (The answer is: 2√10). Enter a whole number (e.g. '40') and hit the 'Simplify' button.
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Simplified Square Roots Table

NumberSimplest radical formDecimal value
2555
26√26≈ 5.099
273√3≈ 5.196
282√7≈ 5.292
29√29≈ 5.385
30√30≈ 5.477
31√31≈ 5.568
324√2≈ 5.657
33√33≈ 5.745
34√34≈ 5.831
35√35≈ 5.916
3666
37√37≈ 6.083
38√38≈ 6.164
39√39≈ 6.245
402√10≈ 6.325
41√41≈ 6.403
42√42≈ 6.481
43√43≈ 6.557
442√11≈ 6.633
453√5≈ 6.708
46√46≈ 6.782
47√47≈ 6.856
484√3≈ 6.928
4977
505√2≈ 7.071
51√51≈ 7.141
522√13≈ 7.211
53√53≈ 7.28
543√6≈ 7.348

FAQ

What is the square root of 40 simplified?

√40 = 2√10

Is 40 a perfect square?

No. 40 = 4 × 10: its largest perfect square factor is 4 = 2², and the factor 10 stays under the radical, so √40 = 2√10.

What is √40 as a decimal?

√40 ≈ 6.325. The decimal never ends and never repeats, so it is always rounded; the exact value is 2√10.

What is the largest perfect square that divides 40?

4 = 2². Dividing gives 40 ÷ 4 = 10, and 10 has no square factor left, so √40 = √4 × √10 = 2√10.

See Also